Default Perspective

If a user has not selected a perspective, the first perspective is activated.
This can be affect with perspective $priority.

use NormanHuth\NovaPerspectives\Perspective;
 
class MyPerspective extends Perspective
{
    /**
     * The perspective priority to order.
     *
     * @var int
     */
    public int $priority = 42;
}

Selected Default Perspective For Each User

You can add the method defaultPerspective to Your Authenticatable Model.
The following examples assume that a string column names default_perspective in the users tables.

class User extends Authenticatable
{
    public function defaultPerspective(): string
    {
        return $this->default_perspective;
    }
}

You can use the PerspectiveHelper class at creating a select field element.

use NormanHuth\NovaPerspectives\PerspectiveHelper; 
use Laravel\Nova\Fields\Select;
 
class User extends Resource
{
    public function fields(NovaRequest $request): array
    {
        return [
            //..
            Select::make(__('Default Perspective'), 'default_perspective')
                ->options(PerspectiveHelper::options()) 
                ->displayUsingLabels(),
            //..
        ];
    }
}